Used in immunological research to quantify Interleukin-39 (IL-39) levels in biological samples such as serum, plasma, and cell culture supernatants. This ELISA kit enables researchers to study the role of IL-39 in inflammatory diseases, autoimmune conditions, and immune regulation. It is particularly useful in experimental models investigating B cell responses and the balance between pro-inflammatory and anti-inflammatory cytokines. The assay provides a sensitive and specific means to monitor IL-39 expression under various treatment conditions, supporting advancements in understanding immune signaling pathways and potential therapeutic targets.